RE: Delta H Calculations
RE: Delta H Calculations
- Subject: RE: Delta H Calculations
- From: "Roger Breton" <email@hidden>
- Date: Thu, 14 Dec 2017 10:12:43 -0500
Thank you, Mr. Pascale!!!
That was crystal clear.
Now, Thomas, what did you have in mind when yuo asked the original question?
What application? Why do you need to distinguish the two color difference
metrics?
I'm interested...
/ Roger Breton
www.graxx.ca (still only in French, I know...)
-----Original Message-----
From: colorsync-users
[mailto:colorsync-users-bounces+graxx=email@hidden] On Behalf
Of dpascale
Sent: Thursday, December 14, 2017 9:43 AM
To: 'Thomas Richard' <email@hidden>; email@hidden
Subject: RE: Delta H Calculations
Thomas,
The usual nomenclature for this space is L*C*h Deltah is not the same as
DeltaH* (or DeltaH*ab as it is sometimes referred to in regards to the CIELAB
color difference).
Deltah is the difference in angle while DeltaH* is the contribution of the
angle difference to the total error, and is equal, for the CIELAB color
difference (DeltaE*ab) to:
DeltaH*ab = SQRT(DeltaE*ab ^2 - DeltaL* ^2 - DeltaC*ab ^2)
Danny
www.babelcolor.com
-----Message d'origine-----
De : Colorsync-users
[mailto:colorsync-users-bounces+dpascale=email@hidden] De la
part de Matthew Finlay Envoyé : 13 décembre 2017 00:00 À : Thomas Richard;
email@hidden Objet : RE: Delta H Calculations
Thanks Thomas,
So just to clarify,
Am I correct in assuming from the below that DeltaH is the absolute value
between each H value in the LCH color space?
-----Original Message-----
From: Thomas Richard [mailto:email@hidden]
Sent: Wednesday, December 13, 2017 12:48 PM
To: email@hidden; Matthew Finlay <email@hidden>
Subject: Re: Delta H Calculations
Hello Matt,
look at Bruce Lindblooms homepage:
http://www.brucelindbloom.com/Eqn_Lab_to_LCH.html
MfG
Thomas
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